Samsung Electronics Co., Ltd.

Kyu-don Choi

Joon-Hee Lee

Heung-bae Lee

Choong-yul Cha

Yun-seong Eo

Sung-jae Jung

Heung-Bae Lee

Kwy-ro Lee

Il-ku Nam

A radio frequency (RF) filter is provided which includes a band pass filter unit and an amplifying unit. If a signal having a frequency in a first band is input, the RF filter performs band pass filtering, and if a signal having a frequency in a second band is input, the RF filter performs an amplifying process. The RF filter can be used for various RF signal processing devices, such as digital broadcast receiving tuners.

RF filter and digital broadcast receiving tuner and RF signal processing device using RF filter

A transmitter having a vertical BJT, capable of reducing power consumption, carrier leakage of a local oscillator and an error vector magnitude (EVM), is disclosed. In the transmitter, vertical BJTs implemented by a standard triplex well CMOS process are used in a frequency up-mixer and a baseband analog circuit including a DAC, an LPF, a VGA and a PGA, thereby improving the overall performance of the transmitter.

Transmitter using vertical BJT

Growing community of inventors

Yongin-si, South Korea

Kyu-don Choi